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题名: STELLAR VARIABILITY AND FLARE RATES FROM DOME A, ANTARCTICA, USING 2009 AND 2010 CSTAR OBSERVATIONS
作者: Oelkers, Ryan J.1; Macri, Lucas M.1; Wang LiFan(王力帆)1, 2, 3; Ashley, Michael C. B.4; Cui, Xiangqun3, 5; Feng LongLong(冯珑珑)2, 3; Gong, Xuefei3, 5; Lawrence, Jon S.4, 6; Qiang, Liu3, 7; Luong-Van, Daniel4; Pennypacker, Carl R.8; Yuan, Xiangyan3, 5; York, Donald G.9, 10; Zhou, Xu3, 7; Zhu ZhenXi(朱镇熹)2, 3
刊名: ASTRONOMICAL JOURNAL
出版日期: 2016-06-01
卷号: 151, 期号:6
关键词: methods: data analysis ; stars: flare ; stars: variables: general
DOI: 10.3847/0004-6256/151/6/166
文章类型: Article
英文摘要: The Chinese Small Telescope Array (CSTAR) carried out high-cadence time-series observations of 20.1 square degrees centered on the South Celestial Pole during the 2008, 2009, and 2010 winter seasons from Dome A in Antarctica. The nearly continuous six months of dark conditions during each observing season allowed for >106 images to be collected through gri and clear filters, resulting in the detection of >10(4) sources over the course of three years of operation. The nearly space-like conditions in the Antarctic plateau are an ideal testbed for the suitability of very small-aperture (<20 cm) telescopes to detect transient events, variable stars, and stellar flares. We present the results of a robust search for such objects using difference image analysis of the data obtained during the 2009 and 2010 winter seasons. While no transients were found, we detected 29 flaring events and find a normalized flaring rate of 5 +/- 4 x 10(-7) flare hr(-1) for late-K dwarfs, 1 1 x 10(-6) flare hr(-1) for M dwarfs and 7 1 x 10(-7) flare hr(-1) for all other stars in our sample. We suggest future small -aperture telescopes planned for deployment at Dome A would benefit from a tracking mechanism, to help alleviate effects from ghosting, and a finer pixel scale, to increase the telescope's sensitivity to faint objects. We find that the light curves of non-transient sources have excellent photometric qualities once corrected for systematics, and are limited only by photon noise and atmospheric scintillation.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: DIGITAL SKY SURVEY ; OPTIMAL IMAGE SUBTRACTION ; VARIABLE-STARS ; ECLIPSING BINARIES ; IA SUPERNOVAE ; LIGHT CURVES ; SPACED DATA ; M DWARFS ; PHOTOMETRY ; TELESCOPE
收录类别: SCI
项目资助者: George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy ; Mitchell-Heep-Munnerlyn Endowed Career Enhancement Professorship in Physics or Astronomy ; Australian Research Council ; Australian Antarctic Division ; Chinese Polar Environment Comprehensive Investigation and Assessment Program
语种: 英语
WOS记录号: WOS:000377990300033
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16254
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Texas A&M Univ, Dept Phys & Astron, George P & Cynthia W Mitchell Inst Fundamental Ph, College Stn, TX 77843 USA
2.Chinese Acad Sci, Purple Mt Observ, Nanjing, Jiangsu, Peoples R China
3.Chinese Ctr Antarctic Astron, Nanjing, Jiangsu, Peoples R China
4.Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia
5.Nanjing Inst Astron Opt & Technol, Nanjing, Jiangsu, Peoples R China
6.Australian Astron Observ, N Ryde, NSW, Australia
7.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China
8.Lawrence Berkeley Natl Lab, Inst Nucl & Particle Astrophys, Berkeley, CA USA
9.Univ Chicago, Dept Astron & Astrophys, 5640 S Ellis Ave, Chicago, IL 60637 USA
10.Univ Chicago, Enrico Fermi Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA
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